Find a General Term A_n for the Geometric Sequence $$a _ { 2 } = - 1 , a _ { 9 } = \frac { 1 } { 128 }$$

Find a general term a_n for the geometric sequence.
- $$a _ { 2 } = - 1 , a _ { 9 } = \frac { 1 } { 128 }$$

A) $a _ { n } = 6 \left( - \frac { 1 } { 4 } \right) ^ { n - 1 }$
B) $a _ { n } = 2 \left( \frac { 1 } { 2 } \right) ^ { n - 1 }$
C) $a _ { n } = 2 \left( - \frac { 1 } { 2 } \right) ^ { n - 1 }$
D) $a _ { n } = \frac { 1 } { 2 } ( - 2 ) ^{ n - 1}$

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